Some older homes The inside outlets located on the exterior can feel like an industrial vacuum when is sucking air from the inside to the outside.
Electrical outlet boxes typically don’t have any insulation behind them, creating what is basically a hole in your wall. On a windy day take some incense or a match and put it in front of an outlet (one without a plug in it of course) and see if you can see air movement.
The simple solution? Install socket sealers to improve energy efficiency. All you have to do is remove your outlet cover with a screwdriver, put on the outlet sealer, and put the cover back on. Pretty Simple!